Internal-combustion engine



June 2l, 1927.

I y 1,632,881 E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed May 21; 1925 l vPatented June 2.1,.1927.l

UNITED-STATES PATENT OFFICE.

VEEETT n; BUnT-NETT, or Los ANGELES, cAIIEoENIA, AssIGNoIt, BY DIRECTl .AND

IIEsNE ASSIGNMENTS, To THE AUTOMOTIVE VALVES co., orl Los AEGELESMCALI- FOBNIA, 'VOLUNTARY TRUST.

INTERNAL-COMBUSTION ENGINE.

AppIication led May 21, 1925. Serial No. 31,804.

My invention relates generally to internal@ combustion engines, and more particularly a device /lfor admitting a dilutent volume of residual gases vor products of combustion.

to the fresh fuel charge volume that is passing through the transfertduct from a pump-- ing chamberI to a combustion chamber in a multi-cylinder engine.

My co-pending patent a plication filed Jan. 15,1925, Ser. No. 252l and application Ser. No. 20,117, filed Apr. 2, 1925 vdis-4 close multi-cylinder engines designed to operate on the two stroke cycle prmciple, and havingcharge Volume transfer ducts lead- 15 ing fromthe pumping chambers to the combustion chambers,l and it is the principal object of my present invention to Vpro'vlde relativelyA simple and eiiicient means,l preferably valve controlled, for admittin'gducts,

. in which velocity of flow of the fresh fuel charge volume is attained, a dilutent volume ofproducts of Acombustion or residual gases, thereby insuring a highl effective mixture of the dilutent volume with the fuel charge Volume '.before the latter passes into the combustion chamber with the result 'that high'\combustion temperatures under high compressionnare overcome, and the ,undesirable action and results of pre-ignition.

and detonation are prevented.

l lWith the foregoing andother objects 1n View, my invention consists in certaln novel features of construction and arrangement of parts that will be hereinafter more fully described and claimed and illustrated in the accompanying drawings in which:

Fig. 1 1s an elevational view of a multi- 'cylinder engine and showing my improved dilutent volume admission means associated with one of the fuelvolume transfer ducts thereof. u v -I Fig. 2 is a vertical section taken lengthwise throu h the center of my improve dilutent voum'e admission devlce'.v

Referring by 4numerals to the ing drawings, 10 designates a cylinder block, 'in which is formed ,a plurality of bores to form combustion chambers and `certain of said bores have two diameters sc as Vto prosvide charge volume pumping chambers, such as 11.

' As more fully set forth in my above mentioned co-pending patent applicat1ons,a fuel y'charge column movement through the transd fer duct 13, toward the 'combustion chamaccompany-r charge volume transfer duct, such as 13 leads from the upperportion ofthe pumping chamber 11 'to thecombustion chambeI of another one of the two diameter c linder and my improved dilutent volume a mission device is directly connected to this duct intermediate its ends. As illustrated, the' device includes a short tubular member-14 that is fitted into and forms a part of duct 13 and positioned withxin this member is a Venturi tube v15.

Depending from tubular member 14; is a 65 bracket 16, the lower end of which carries a short tubular member 17 that is parallel -with member 14, and projecting from the inner end of this member17 through bracket 16 and into the passageway through venturi member 14 isa jet tube 18.

Formed'in the end of tube 17, directly opposite the lower end of' this jet tube 18, is an opening that is normally closed by a plug 19, thus giving ready access to said jet tube, 4in the event of removed replacement or repairs. Secured to' the end of tube 17 ,opposite the end thatis fitted with jet tube 18 and plugll, is the upper end of a.4 tubular fitting 20, aving near its upper end, andv inlet port l 21, for the admission of the dilutent volume, such as residual gases or products of com-- bustion. A spring-held-poppet valve 22 is adapted to rest on a seat 23 that is formed inthe upper portion of tubular member 20 above inlet 21, and said valve is lifted from its seat by any suitable mechanical means, preferably a push rod, such as24 that is actuated 90 by'means of a cam or, eccentric 25.

The vajlve unseating means must neces'- sarily be timed so as to open or unseat the valve, only during the period ofI fresh ber to which said Vduct leads. Obviouslyl "the valve\'23 must be closed during vthe period of the suction.or inlet strokeof the 1 piston within the @pumping chamber to4 100 which thev transferduct is connected.

vArranged for operation within tubular member 17 4is a. throttle valve 26, the lshaft on axis of which is provided with a crank arm 27 and the latter being connected by a 105 rod 28 or the lik\e,'to the levethat actuates )A heef thethrottle of the carburetor that supplies aseous fuel mixture to the pumping chami ers of the engine.

The connections between arm 27 land car# buretor throttle actuating lever are such that the dilutent volume throttle valve v26 is caused to open at a predetermined time in relation to the opening of said carburetor throttle valve. y

As the engine -with which my improved dilutentl volume admission device is associated, is operated, the opening of the carburetor throttle valve will, at certain period, open throttle valve 26.

On the inward movement of the piston within the pumping chamber from which duct 13 leads, a fresh 4fuel charge will be pumped or forced through said "duct, and simultaneous with this action7 poppet valve 22 is unseated to admit through port 21 and through theupper portion of member 20 and through tubular member 17, a dilutent volume of residual gasesI or products 4of combustion. u Y

The velocity of the flow of charge volume through duct .13 and particularly through the venturi restriction therein will produce an inductionof the dilutent volume through jet tube 18 from the chamber within tubularc member 17, and this dilutent volume will be thoroughly mixed with the charge volume as the latter passes into the combustion chamber. The bore of tube 18 and the venturi opening 15 should beproperly calibrated in order to meter t e proper proportion of di-` lutent volume to the fuel charge volume.

During the. suction stroke of the piston within .the-'pumping chamber, valve 22 is closed, thereby oil the inletof dii lutent volume to the transfer duct.

A dilutent volume admission device of my improved construction is Vcomparativel simple, may be easily and cheaply produce and is very effective in performing its intended functions.

It will be readily understood that minor admission device and changes in the size, form and construction bustion chamber, 4said duct having a venturi restriction therein and means for admitting a `dilutent volume to .said duct Vad- .jacen't' 'to said venturi restriction.

2. In combination with an internal combustionj engine having a pumping chambera duct leading and al combustion chamber, from said pumping chamber vto said combustion chamber, said duct having a venturi restriction therein, means for admitting a dilutent volume to said duct adjacent to said venturi restriction and valvular means associated with said admission means for controlling the pasJsage of dilutent volume therethrough. v

In testimony7 whereof I aix my signature.

` EVERETT R. BURTNETT. 

